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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe0803df3ea644699ce3e35dd39c5685cfeca918999dbb12eb9778bfbf68613' 
  AND token = 'z8LPVIgmFJ4m0z5fFGVJrkosPTBi1unCAw9uprlZGVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}